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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4c7e0a3ca0cb0f00077713df0c9adf47951c749439c4691fd282f7a8fa7ef7d' 
  AND token = '7q/oVSjJAQOPm800R5bqd0tYGcORhGeLqy62jnlM4e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}